linux-kernel - Re: [PATCH] drm/rockchip: vop: fixup linebuffer mode calc error

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Message-ID: <2475172.s4GHAT5PDW@phil>
Date:   Tue, 17 Apr 2018 13:14:08 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     Sandy Huang <hjc@...k-chips.com>
Cc:     dri-devel@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/rockchip: vop: fixup linebuffer mode calc error

Hi Sandy,

Am Dienstag, 17. April 2018, 12:15:07 CEST schrieb Sandy Huang:
> When video width is bigger than 3840 the linebuffer mode
> should be LB_YUV_3840X5.

Can you explain that a bit better?

I.e. when looking at the code, the very first check is width > 2560.

So it seems your change targets some YUV mode with width > 3840
which should be mentioned in the commit message, so people like
me don't scratch their head in confusion ;-)

Similarly that check is actually width > 1280 to set LB_YUV_3840X5,
so I guess you're actually wanting any YUV mode bigger than
1280px should use LB_YUV_3840X5?


Heiko

> Signed-off-by: Sandy Huang <hjc@...k-chips.com>
> ---
>  drivers/gpu/drm/rockchip/rockchip_drm_vop.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.h b/drivers/gpu/drm/rockchip/rockchip_drm_vop.h
> index 56bbd2e..3e7501b 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.h
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.h
> @@ -332,7 +332,7 @@ static inline int scl_vop_cal_lb_mode(int width, bool is_yuv)
>  
>  	if (width > 2560)
>  		lb_mode = LB_RGB_3840X2;
> -	else if (width > 1920)
> +	else if (!is_yuv && width > 1920)
>  		lb_mode = LB_RGB_2560X4;
>  	else if (!is_yuv)
>  		lb_mode = LB_RGB_1920X5;
>